diff --git a/inc/rs485.h b/inc/rs485.h
index 663bf2b..efea633 100644
--- a/inc/rs485.h
+++ b/inc/rs485.h
@@ -26,9 +26,16 @@
 
 #define RX_BUFFER_SIZE 64
 
+typedef enum {
+    VALIDATION_SUCCESS = 0,
+    VALIDATION_CRC_ERROR = 1
+} validation_result_t;
+
 void rs485_config(void);
 void process_command(uint8_t *cmd, size_t length);
 uint8_t calculate_crc(uint8_t data[], size_t data_length);
+validation_result_t validate_package_header(uint8_t *data);
+validation_result_t validate_package_type(uint8_t *data);
 void eddy_current_value_report(void);
 void tempture_value_report(void);
 
diff --git a/src/gd32e23x_it.c b/src/gd32e23x_it.c
index a8e3849..b22650e 100644
--- a/src/gd32e23x_it.c
+++ b/src/gd32e23x_it.c
@@ -132,9 +132,18 @@ void USART0_IRQHandler(void) {
 
         // 检查是否接收到换行符，表示指令结束
         if (received_data == '\n') {
-            // rx_buffer[rx_index] = '\0'; // 添加字符串结束符
-            process_command(rx_buffer, rx_index); // 处理指令
-            rx_index = 0; // 重置缓冲区索引
+            if (calculate_crc(rx_buffer, rx_index - 2) == rx_buffer[rx_index - 2]) {
+                // printf("CRC check success\r\n");
+                // rx_buffer[rx_index] = '\0'; // 添加字符串结束符
+                process_command(rx_buffer, rx_index); // 处理指令
+                rx_index = 0; // 重置缓冲区索引
+            } else {
+                // printf("CRC check failed\r\n");
+                printf("%c%c%c%c\r\n", 0xB5, 0xF2, 0x00, 0xF2);
+                rx_index = 0; // 重置缓冲区索引
+                return;
+            }
+
         }
     }
 }
diff --git a/src/rs485.c b/src/rs485.c
index 52ff6d7..93d0499 100644
--- a/src/rs485.c
+++ b/src/rs485.c
@@ -7,7 +7,7 @@
 extern uint32_t g_temperature_uint32;
 extern uint32_t g_eddy_current_value_uint32;
 
-uint8_t package_header[3] = {0xB5, 0x00, 0x04};
+uint8_t package_header[3] = {0xB5, 0xF0, 0x04};
 uint8_t package_data[4] = {0};
 
 void rs485_config(void) {
@@ -39,29 +39,28 @@ void rs485_config(void) {
 
 void process_command(uint8_t *cmd, size_t length) {
     char combined_str[3];
-    printf("%c", calculate_crc(cmd, length - 2));
-    printf("%c", cmd[length - 2]);
 
-    if (calculate_crc(cmd, length - 2) == cmd[length - 2]) {
-        printf("CRC check success\r\n");
-    } else {
-        printf("CRC check failed\r\n");
-        return;
-    }
+    if (cmd[0] == 0xD5) {
+        if (cmd[1] == 0x03) {
+            if (cmd[2] == 0x02) {
+                sprintf(combined_str, "%c%c", cmd[3], cmd[4]);
+                if (strcmp(combined_str, "M1") == 0) {
 
-
-    if (cmd[0] == 0xD5 && cmd[1] == 0x03) {
-        if (cmd[2] == 0x02) {
-            sprintf(combined_str, "%c%c", cmd[3], cmd[4]);
-            if (strcmp(combined_str, "M1") == 0) {
-
-                eddy_current_value_report();
-            } else if (strcmp(combined_str, "M2") == 0) {
-                tempture_value_report();
+                    eddy_current_value_report();
+                } else if (strcmp(combined_str, "M2") == 0) {
+                    tempture_value_report();
+                } else {
+                    printf("%c%c%c%c%c%c%c\r\n", 0xB5, 0xF0, 0x03, 0x65, 0x72, 0x72, 0x3C);
+                    return;
+                }
             } else {
-                printf("******\r\n");
+                printf("%c%c%c%c\r\n", 0xB5, 0xF1, 0x00, 0xF1);
             }
+        } else {
+            printf("%c%c%c%c\r\n", 0xB5, 0xF5, 0x00, 0xF5);
         }
+    } else {
+        printf("%c%c%c%c\r\n", 0xB5, 0xF3, 0x00, 0xF3);
     }
 }
 
@@ -75,8 +74,26 @@ uint8_t calculate_crc(uint8_t data[], size_t data_length) {
     return (uint8_t)(crc & 0xFF);
 }
 
+validation_result_t validate_package_header(uint8_t *data) {
+    if (data[0] == 0xD5) {
+        return VALIDATION_SUCCESS;
+    } else {
+        printf("%c%c%c%c\r\n", 0xB5, 0xF3, 0x00, 0xF3);
+        return VALIDATION_CRC_ERROR;
+    }
+}
+
+validation_result_t validate_package_type(uint8_t *data) {
+    if (data[1] == 0x03) {
+        return VALIDATION_SUCCESS;
+    } else {
+        printf("%c%c%c%c\r\n", 0xB5, 0xF3, 0x00, 0xF3);
+        return VALIDATION_CRC_ERROR;
+    }
+}
+
 void eddy_current_value_report(void) {
-    package_header[1] = 0xF0; //eddy current
+    // package_header[1] = 0xF0; //eddy current
 
     package_data[0] = (g_eddy_current_value_uint32 >> 24) & 0xFF;
     package_data[1] = (g_eddy_current_value_uint32 >> 16) & 0xFF;
@@ -94,7 +111,7 @@ void eddy_current_value_report(void) {
 }
 
 void tempture_value_report(void) {
-    package_header[1] = 0xF1; //temperature
+    // package_header[1] = 0xF1; //temperature
 
     package_data[0] = (g_temperature_uint32 >> 24) & 0xFF;
     package_data[1] = (g_temperature_uint32 >> 16) & 0xFF;